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Tired of the same old 5,000 songs on your iPod? How about 20 million? For $10 a month, Spotify, the country's leading music streaming music service, offers unlimited access to a fire hose of music—as well as the kind of connoisseurship you used to get from the record-store guy to help make sense of it all.

Spotify's 100-plus desktop apps help you find the music you want, as well as what you didn't know you wanted. Consider Blue Note, the namesake app of the famed jazz label. The greats are there, like John Coltrane, Miles Davis, and Dexter Gordon, as well as contemporary artists like Robert Glasper and Cassandra Wilson.

Use Blue Note's timeline scroll bar to study the arc of the label's development, filtering by year, instrument, genre, and artist. We narrowed the period to albums released from 1939 to 1955 and stumbled across The Port of Harlem Jazzmen, which contains clarinetist Sidney Bechet's early recordings, dating back to the year the label opened its doors.

Once you find the albums you want, Spotify can automatically turn them into playlists for iPhone or Android.

(To find an app, start with Spotify's App Finder, then go to Top Apps, click on Discovery, and scroll through the list.)

Classify is effectively symphonics for dummies. While the catalog is wanting, it offers entertainment value. Icons of composers' busts help you find Bach, Barber, and Bizet; you can create mood-based playlists—dark, happy, relaxing, sad—or subscribe to ready-made lists, like Greatest Video Game Music.

Any Decent Music helps you discover the newest releases. The app aggregates album reviews daily from over 50 sources, including SPIN and Pitchfork, and lists them by point value. It even has a link to take you to the original review.